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| Number | Title | Issue Date |
| 7880593 | Audible signaling device The invention is an improved audible signaling device with a speaker, a sound chamber, and associated circuitry. The device creates a loud, audible fundamental frequency, and harmonic frequencies that are relatively equal in amplitude to the amplitude of the fundame... | 02/01/2011 |
| 7194287 | Electric-mechanical-acoustic-transducer and portable communication device including the same An electric-mechanical-acoustic-transducer includes a diaphragm; a movable section; a driving section for generating a driving force for vibrating the diaphragm and the movable section; and a suppression section for suppressing a sharpness (Q factor) of a vibration ... | 03/20/2007 |
| 7068176 | Smoke detector with sound quality enhancement chamber A smoke detector having a sound quality enhancement chamber for increasing the sound quality of alarms produced by a sound producing device in the smoke detector. In at least one embodiment, the sound quality enhancement chamber is formed by a housing and a plate su... | 06/27/2006 |
| 7038576 | Electropneumatic horn An electropneumatic acoustic horn is disclosed, comprising an electric compressor unit for generating compressed air and a sound wave generator comprising at least an acoustic chamber associated to at least a volute wound acoustic duct adapted to propagate the produ... | 05/02/2006 |
| 7005983 | Methods and apparatus for detecting refrigerator door openings A detection apparatus for detecting refrigerator door openings is coupled to at least one switch configured to be activated by a door opening. When the door is opened, the switch is activated and inputs a signal to the detection apparatus. The detection apparatus re... | 02/28/2006 |
| 6995659 | Sound generating transducer A sound transducer comprises at least one sound unit based on at least one radially sound emitting diaphragm arranged in a substantially cylindrical or tubular form, the diaphragm including electromechanically converting material capable of creating sound by changin... | 02/07/2006 |
| 6792126 | Information processing device and speaker unit applicable thereto An information processing device and a speaker unit applicable to the device. In one aspect of the present invention, the device includes a housing, a pole piece, a voice coil, a magnet, and a frame. The housing has an elastically vibratory vibration region. The pol... | 09/14/2004 |
| 6420965 | Vibrator In a method of controlling a vibrator, the vibrator is first driven towards a first frequency during a first interval and then is driven towards a second frequency during a second interval. In a preferred embodiment the first frequency is higher than the ... | 07/16/2002 |
| 6259935 | Electro-mechanical-acoustic transducing device An electro-mechanical-acoustic transducing device includes: an electro-mechanical-acoustic transducer which has at least one resonance frequency, for converting an input electric signal into only vibration, or into both vibration and sound; a signal suppl... | 07/10/2001 |
| 6215391 | Variable frequency buzzer assembly A buzzer assembly for a personal communications device changes geometry in order to emit sounds at a variety of frequencies at an approximately constant volume, such as for playing melodic alerts. The buzzer assembly incorporates a buzzer and gasket to cr... | 04/10/2001 |
| 5969614 | Alarm tag An alarm tag made of two parts, one of which is provided with a pin (13) attached to the one part (12) to be located on one side of the product (11) with the pin extending through the product into locking engagement with the other part (10) located on the... | 10/19/1999 |
| 5894264 | Apparatus for generating an audible tone An apparatus for generating a audible tone is disclosed. The apparatus includes a non-ferromagnetic container 105, a ferromagnetic member 110, a coil 115, a first stationary lead wire 175, a second stationary lead wire 180, and a flexible ferromagnetic di... | 04/13/1999 |
| 5677679 | Sound device for message decoder A sound device can be incorporated into a message decoder. The message decoder roughly comprises a decoder body 10, a front shield plate 20, a buzzer 22, an IC substrate 30 and an LCD 32, a back shield plate 40, an RF receiver 50, and a decoder outer lid ... | 10/14/1997 |
| 5625700 | Method of farbicating an electroacoustic transducer The present invention provides a fabrication method of an electroacoustic transducer capable of simplifying an assembling process on a lead frame and realizing an automatic assembly. The method comprises steps of forming pole piece portions, forming a lea... | 04/29/1997 |
| 5596311 | Method and apparatus for driving a self-resonant acoustic transducer A method and system employing a feedback signal indicative of monitored motion of an electro-mechanical acoustic transducer to generate one or both of a control signal for driving the transducer at its natural resonance frequency, and a warning signal ind... | 01/21/1997 |
| 5467323 | Electroacoustic transducer In an electroacoustic transducer, the opening portion of a casing body which contains therein a magnetic driving portion for converting an electric signal into a sound is closed by a casing cap to form a resonance space (resonance chamber) which resonates... | 11/14/1995 |
| 5321388 | High efficiency phase and amplitude matched multiple horn electronic siren An electronic siren apparatus has a primary horn with a throat which splits into matched secondary horns each having sides, an output end, a longitudinal axis, and a circumference. The secondary horns are folded back toward and around the primary horn and... | 06/14/1994 |
| 5287084 | Thin buzzer A small and thin buzzer which can be mounted on a printed circuit board. A buzzer assembly and a lead connecting chamber are provided in a buzzer case. One end of each of the terminals for external connection is extended to the inside of the lead connecti... | 02/15/1994 |
| 5263435 | Volute horn and method of manufacturing A volute horn is assembled by integrally attaching a horn body to a resonating device forming a volute sound path. The horn body includes a vibration generating unit for vibrating diaphragm to create a sound, and a cover facing the outer surface of the di... | 11/23/1993 |
| 5260681 | Paging receiver with resonant box A paging receiver provided with a speaker unit including a first resonant box and a second resonant box in order to produce a higher sound pressure without however enlarging a casing of the receiver body is disclosed. The second resonant box is formed mad... | 11/09/1993 |
| 5157374 | Alarm buzzer and accessory An alarm buzzer produce an alarm sound from a sound-producing device installed in a hollow container in which an opening through which the sound is sent out is arranged not in the face opposite the sound-producing face of the device but in one or both of ... | 10/20/1992 |
| 5070319 | Door ajar alarm for refrigeration unit An alarm system for signalling when a door of a refrigeration unit compartment is not fully closed comprises an alarm condition sensing system having a door sealing gasket magnet and a magnetically actuated switch. The gasket magnet produces an elongated ... | 12/03/1991 |
| 4963855 | Warning sound generating device A warning sound generating device includes a sound source member and an enclosure for protecting the sound source member. A front wall of the enclosure and a sound emitting portion of the sound source member face each other. The front wall of the enclosur... | 10/16/1990 |
| 4796009 | Electronic warning apparatus The outdoor alerting and warning device of this invention comprises numerous electronic drivers and an axially shallow drum-shaped resonance chamber having an inside diameter equal to a whole-number multiple of one-quarter of the wavelength of a sound wav... | 01/03/1989 |
| 4413253 | Miniature sounder with double tuned cavity A miniature sounder having a diaphragm closing one end of a tuned chamber. The other end of the chamber communicates with the interior of a tuned housing. The chamber and housing are both tuned to the desired oscillating frequency of the diaphragm with th... | 11/01/1983 |
| 4409588 | Miniature sounder with multi-part tuned cavities A miniature sounder having a diaphragm closing one end of a tuned chamber. The other end of the chamber communicates with the interior of a tuned housing through which an open-ended enclosure extends. The oscillating frequency of the diaphragm. The housin... | 10/11/1983 |
| 4297538 | Resonant electroacoustic transducer with increased band width response An electroacoustic transducer which includes a vibratile diaphragm operating at resonance has its narrow band width response characteristic increased by an order of magnitude by the use of a uniquely designed acoustic coupler in combination with the reson... | 10/27/1981 |
| 4267552 | Electromagnetic sound generator for automative vehicles and the like An electromagnetic sound generator, such as an automobile horn, has a thialled ferromagnetic coil housing with a rim bent back upon itself to form an outwardly projecting peripheral flange embracing a marginal zone of a membrane. A collar formed as an an... | 05/12/1981 |
| 4191944 | Electromagnetic sound generator and method of making same An electromagnetic sound generator, such as an automobile horn, has a thin-walled ferromagnetic housing closed at one end by a membrane which carries an armature extending into an electromagnetic coil mounted in the housing. The rim of the membrane is emb... | 03/04/1980 |
| 4142186 | Means for improving the electroacoustical properties of a buzzer The electroacoustical properties of an electromechanical vibrating device for producing an audible signal are improved by attenuating undesirable frequencies of the audible signal to produce a predominant frequency and by accentuating the predominant freq... | 02/27/1979 |
| 4027115 | Electroacoustic sound generator An electroacoustic sound generator of the type having a diaphragm vibrating in the audio frequency range is described. The diaphragm is mounted in a housing which is constructed to form first and second volumes, the former being smaller than the latter. T... | 05/31/1977 |
